113 строки
3.4 KiB
C
113 строки
3.4 KiB
C
/*
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* The file intends to implement dynamic creation of EEH device, which will
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* be bound with OF node and PCI device simutaneously. The EEH devices would
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* be foundamental information for EEH core components to work proerly. Besides,
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* We have to support multiple situations where dynamic creation of EEH device
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* is required:
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*
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* 1) Before PCI emunation starts, we need create EEH devices according to the
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* PCI sensitive OF nodes.
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* 2) When PCI emunation is done, we need do the binding between PCI device and
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* the associated EEH device.
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* 3) DR (Dynamic Reconfiguration) would create PCI sensitive OF node. EEH device
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* will be created while PCI sensitive OF node is detected from DR.
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* 4) PCI hotplug needs redoing the binding between PCI device and EEH device. If
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* PHB is newly inserted, we also need create EEH devices accordingly.
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*
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* Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2012.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/export.h>
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#include <linux/gfp.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/string.h>
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#include <asm/pci-bridge.h>
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#include <asm/ppc-pci.h>
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/**
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* eeh_dev_init - Create EEH device according to OF node
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* @dn: device node
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* @data: PHB
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*
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* It will create EEH device according to the given OF node. The function
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* might be called by PCI emunation, DR, PHB hotplug.
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*/
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void *eeh_dev_init(struct device_node *dn, void *data)
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{
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struct pci_controller *phb = data;
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struct eeh_dev *edev;
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/* Allocate EEH device */
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edev = kzalloc(sizeof(*edev), GFP_KERNEL);
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if (!edev) {
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pr_warning("%s: out of memory\n", __func__);
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return NULL;
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}
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/* Associate EEH device with OF node */
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PCI_DN(dn)->edev = edev;
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edev->dn = dn;
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edev->phb = phb;
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INIT_LIST_HEAD(&edev->list);
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return NULL;
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}
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/**
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* eeh_dev_phb_init_dynamic - Create EEH devices for devices included in PHB
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* @phb: PHB
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*
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* Scan the PHB OF node and its child association, then create the
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* EEH devices accordingly
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*/
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void eeh_dev_phb_init_dynamic(struct pci_controller *phb)
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{
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struct device_node *dn = phb->dn;
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/* EEH PE for PHB */
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eeh_phb_pe_create(phb);
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/* EEH device for PHB */
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eeh_dev_init(dn, phb);
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/* EEH devices for children OF nodes */
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traverse_pci_devices(dn, eeh_dev_init, phb);
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}
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/**
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* eeh_dev_phb_init - Create EEH devices for devices included in existing PHBs
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*
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* Scan all the existing PHBs and create EEH devices for their OF
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* nodes and their children OF nodes
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*/
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static int __init eeh_dev_phb_init(void)
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{
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struct pci_controller *phb, *tmp;
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list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
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eeh_dev_phb_init_dynamic(phb);
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pr_info("EEH: devices created\n");
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return 0;
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}
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core_initcall(eeh_dev_phb_init);
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